private void showPopWindow(Context context, View parent) {

		// TODO Auto-generated method stub

		final PopupWindow pw;

		View myView;

		LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

		myView = inflater.inflate(R.layout.pop, null);

		Button pop_OK = (Button) myView.findViewById(R.id.button_ok);

		Button pop_Cancel = (Button) myView.findViewById(R.id.button_cancel);

		final EditText pop_User = (EditText) myView.findViewById(R.id.edittext);

		final EditText pop_Password = (EditText) myView.findViewById(R.id.password);

		pw = new PopupWindow(myView, 500, 200, true);
		pw.setWidth(LayoutParams.WRAP_CONTENT);                
		pw.setHeight(LayoutParams.WRAP_CONTENT);   
		pw.showAtLocation( myView, Gravity.TOP | Gravity.CENTER, 0, 0);

 
		pop_OK.setOnClickListener(new OnClickListener() {

			public void onClick(View v) {

				//showPop_PopWindow();

				// TODO Auto-generated method stub

			}


		});

		pop_Cancel.setOnClickListener(new OnClickListener() {

			public void onClick(View v) {

				pw.dismiss();//

			}

		});

		pw.showAsDropDown(MyButton);

	}
 

只要程式碼中呼叫以上函式就可以了

 XML檔案程式碼如下 pop.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#ffff00"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/mytextview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello" />

    <TextView
        android:id="@+id/mytextview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="賬號" />

    <EditText
        android:id="@+id/edittext"
        android:layout_width="180dip"
        android:layout_height="wrap_content" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="密碼" />

    <EditText
        android:id="@+id/password"
        android:layout_width="180dip"
        android:layout_height="wrap_content"
        android:password="true" />

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:background="#ffff00"
        android:orientation="horizontal" >

        <Button
            android:id="@+id/button_ok"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="確定" />

        <Button
            android:id="@+id/button_cancel"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="取消" />
    </LinearLayout>

</LinearLayout>
 

以上紅色部分特別注意：

自適應螢幕

popupWindow.setWidth(LayoutParams.WRAP_CONTENT);               
    popupWindow.setHeight(LayoutParams.WRAP_CONTENT);  

view自適應

              LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
                LinearLayout linearLayout = new LinearLayout(c);
                linearLayout.setLayoutParams(params);

同樣的

 pw.showAtLocation(view,Gravity.TOP | Gravity.LEFT, 252, 50);

以上面一句為例：第一個引數是指PopupWindow顯示在哪一個View之上．後面三個引數控制PopupWindow顯示的位置，此處表明PopupWindow顯示在距左上角x252個畫素，y50個畫素．

 專案下載：http://download.csdn.net/detail/penglijiang/4419203